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The constituency was created by the Redistribution of Seats Act 1885 for the 1885 general election. Of all the Glamorgan seats created by the 1885 redistribution, South Glamorgan was the only one where the Liberal Party could not be assured of victory. The Bute and Dunraven families exercised a powerful influence. The mining areas in the north of the constituency, including the lower reaches of the Rhondda, and the cosmopolitan town of Barry were strongly Liberal but these were juxtaposed against the conservatism of the Vale of Glamorgan and the genteel settlements of Penarth and Llandaff.
From 1885 until 1895 the seat was held by the Liberals but in 1895 it was captured by a Conservative landowner, who held the seat with a reduced majority in 1900.
William Brace
In 1903, South Glamorgan became the focus of an internal battle within the Liberal Party around whether a labour representative should become the candidate. Although the miners composed only a fifth of the electorate, the claims of William Brace, vice president of the South Wales Miners Federation were also championed by the dockworkers of Barry. Following the intervention of the Liberal Chief Whip, Brace was duly chosen and won the seat in 1906. He held it until its abolition in 1918.
Another General Election was required to take place before the end of 1915. The political parties had been making preparations for an election to take place and by July 1914, the following candidates had been selected;
^ Debrett's House of Commons & Judicial Bench, 1901
^ The Times House of Commons Guide 1910, 1911, 1919, Politico's Publishing Page 101 1911 Section
^ The Times House of Commons Guide 1910, 1911, 1919, Politico's Publishing Page 92 1910 Section
^ Debrett's House of Commons & Judicial Bench, 1916
^ Although some sources described Brace as a Liberal or Lib-Lab candidate, the lengthy discussion in Roy Gregory, The Miners and British Politics shows that he stood as a Labour Party candidate in both 1910 elections, and was surprised not to face a Liberal Party opponent in December.